def bubble_sort(nums):
    swapped = True
    while swapped:
        swapped = False
        for i in range(len(nums)-1):
            if nums[i]> nums[i+1]:
                      nums[i], nums[i+1] = nums[i+1], nums[i]
                      swapped = True
def readlist(filename)
    file=open(filename, "r")
    data=file.readlines()
    return data
